Indicator device



April 1933- H. A. FLAMMER 0 INDICATOR DEVICE Filed Sept. 9, 1930INVENTOR By HAFLAMMER J? %(de 250mg ATTORNEK Patented Apr. 1 8, 1933"UNITED STATES PATENT OFFICE HOWARD A. FLAMMER, 0E NEWARK, NEW JERsEY,ASSIGNOR T0 BELL TELEPHONE LABORATORIES, INCORPORATED, OF NEW YORK, N.Y., A CORPORATION OF NEW YORK INDICATOR DEVICE Application filedSeptember 9, 1930. Serial No. 480,651.

This invention relates to an indicator device for use in artificialrespiration producing apparatus of the type disclosed in a copendingapplication to J. S. Waterman, filed July 19, 1930, Serial No. 462,158.-In that machine the patient is placed on an inclined base with his armpits resting on movable supporting members. A reciprocating handleoperating member is provided for imparting movements to the movablesupports and to a pair of bars disposed in lines parallel to theinclined surface of the base. These bars carry a belt arranged to securepads in close contact with the body of the patient, the arm pitsupporting members and the belt being actuated in such a sequence ofoperation as to induce artificial respiration in the manner of theso-called Schaefi'er method of resuscitation.

In such a machine, however, it is necessary that the handle operatingmember be actuated'at a constant number'of strokes per unit of time inorder to secure the desired effect.

The object of this invention is to provide a device which will indicatetherate of movement of the operating member of the machine in a simpleand positive manner.

In accordance with this invention a pressure gauge of the Bourdon typeis operated by air pressure built up in an expansion chamber by themovement of a piston in a cylinder. This piston is actuated by themovement of the reciprocating handle memher and a system of valvescontrols the pressure in the chamber, the gauge being graduated in amanner to translate the pressure in the chamber in terms of the numberof strokes of the handle per unit of time.

In the drawing,

Fig. 1 is a perspective assembly view of the artificial respirationproducing machine showing the indicator mounted thereon;

Fig. 2 is a view of the indicator with a number of operating parts insection and Fig. 3 is another sectional view of the indicator.

In more detail the artificial respiration producing machine to whichthis indicator device may be used generally consists of a base 10 havingan inclined top surface provided with a pad or mattress 14 upon whichthe patients chest is supported. A head rest 15 is adjustably mounted onbrackets 17 and 18 which are in turn secured at the lower endsto thebase 10. A pair of supporting plates 19 andQO fit the patients arm pitsandare hinged to the base 10. These'plates are arranged to be actuatedto and from each other by the movement of a hand operating member 26,through respective connecting rods such as 24. to opposite sides ofthebase 10 on pivots 26, one of them being shown in Fig. 1. To the oppositesides of base 10 are pivotally mounted as at 39, the bell crankleverslO. The ends of these levers are connected to the operating handlelever members as at 41- and to a pair of parallelly disposed movablebars 35 to which the belt portions 27 and 28 are attached and arrangedto be secured in close contact with the body'of the patient. Each ofthese bars are pivoted at their other ends on links 38 in order toimpart to the-belt 27'28, during each stroke, movements in directionssubstantially at right angles'toeach other, the combined actions of thesupporting plates 19 and 20 and the belt 27-28 on the patient beingbetter known as the Schaefi'er method of resuscitation.

One of the bell-crank levers 4.0 is provided The handle lever is pivotedwith an arm 50 towhich a rod 51 is con nected. This rod carries a piston52 arranged to be reciprocated in a cylinder 53 for pumping air in apressure chamber 54 under control of a valve G0 which consists of a.ball 68 and a spring 67 holding this ball against the seat of thisvalve. 3T0 chamber 54: is connected a gauge '55 through the medium of apipe 56. The inlet valve IN consists, of a cylinder 159 having anaperture 59 and a piston'57 having an aperture 58 arranged to registerwith. the aperture 7 is actuated through the movement of piston 57 inturn under control of piston 52, a screw 66 being provided for changingthe areaof openin'g68 for controlling the air pressure in the chamber 54during the return stroke of piston 52 and thereby preventing theimmediate fall of the pressure in the. chamber 54 and too greatvariations in the fluctuation 0 the gauge.

In a typical example of operation the movement of the operating handlemember 26. in a downward direction is effective to actuate the bars andthe belt 27-28 carried thereby through the bell crank levers 40 and thesupporting plates .19 and 20 through the connecting rods 24. Themovement of one of the bell crank levers 40 through its armis eifectiveto impart movement to the piston '52 from position shown in Fig. 2 toposition shown in Fig. 3 for pumping air in chamber 54 against theresistance, of thespring 67 holding the ball 68 against the valve seat.The resistance of spring 67 causes the operation of piston 57 positionshown in Fig. 2 to position shown in Fig. 3 for closing the opening 59and simultaneously causes the opening of valve 0U which opening iseffected through the medium of spring .65 upon the release of thebell-shaped member 64 byarm 61. The continued movement of piston 52 isefiective to build up an air I pressure in the expansion chamber 54which pressure is indicated by the gauge 55. But it is to be noted thatthe opening of outlet 63 is so adjusted as to preventthe building of atoo high pressure in the chamber 54 and thus prevents a too greatoscillation of the gauge pointer. Upon the beginning of thereturn orintake movement of piston 52 to normal the spring 67 forces the ball 68against its seat and the continued movement of this piston is efiectiveto cause a vacuum in the cylinder 53 which vacuum causes the piston 57to move from position shown in Fig. 3 to position as shown in Fig. 2wherein the opening 58 of piston 57 registers with opening 59 ofcylinder 159 and thus permitting the return stroke of the piston 52 tonormal. The downward movement of the piston 57 and the arm 61 carriedthereby is effective to operate the bell-shaped member 64 to partiallyclose the opening 63 of the which would otherwise occur if this valveremained entirely open during this lapse of time. The flow of airthrough the opening the expansion chamber 54 which pressure would beindicated by the gauge pointer. Similarly, the uniform movement of thehandle operating lever will be efiective to maintain the pressure in thepressure chamber 54 substantially constant for any pressure value andthis condition will be indicated by the gauge pointer thus giving apositive indicationof the movement of the handle operating member.

4 What is claimed is:

1. In an indicator for a machine for mechanically inducing .artificialrespiration, said indicator comprising a cylinder, a piston movable insaid cylinder and actuated by said machine, an air inlet valveconnecting with said cylinder and actuated upon a movement of saidpiston in said cylinder, a pressure chamber, a valve operable under theaction of said piston upon both movements of the latter for admittingand retaining the air in said chamber, a two-way movable valve actuatedone Way by the first mentioned valve for closing it and the other wayautomatically for controlling the pressure in said chamber and a gaugefor indicating such a pressure.

2. In an indicator, a cylinder, a piston movable in said cylinder, anair inlet valve and an air outlet valve actuated according to themovement of said piston in said cylinder, a pressure chamber connectedto the air outlet valve, another valve connected to said chamber, meanscarried by the air inlet valve for closing the last mentioned valve andautomatically operable means for opening it upon .a certain operation ofsaid piston in said cylinder for controlling the pressure in saidchamber and a gauge connected to said chamber for indicating such apressure.

In witness whereof, I hereunto subscribe my name, this 5th day ofSeptember, 1930.

HOWARD A. FLAMMER.

valve OU in order to maintain the air pressure in chamber 54 within asmall pressure difference during the return stroke of the handleoperating member 26 and the piston 52 connected thereto in order toprevent too violent oscillations of the gauge pointer

